In that case they probably incorrectly believed island to be derived to isle (same with the H in Anthony which comes from the Roman person name Antonius and not the Greek anthos ‘flower’), so I’m not sure I’d call it a whim… but certain letters were added at the end of words otherwise they’d be too short, and IIRC (I can’t seem to find a cite right now) money was spelled with a O and give with an E because the sequence un and final v would look bad in blackletter.
Sometimes it is, for example the S in “island” was added to make it look like more like “isle”, from which it did not originate.
Wait, what? I’d always assumed...
In that case they probably incorrectly believed island to be derived to isle (same with the H in Anthony which comes from the Roman person name Antonius and not the Greek anthos ‘flower’), so I’m not sure I’d call it a whim… but certain letters were added at the end of words otherwise they’d be too short, and IIRC (I can’t seem to find a cite right now) money was spelled with a O and give with an E because the sequence un and final v would look bad in blackletter.